CN114482949B

CN114482949B - Pressurizing water injection device

Info

Publication number: CN114482949B
Application number: CN202011164438.5A
Authority: CN
Inventors: 王书慧; 郎宝山; 吴非; 管九洲; 刘江玲; 付强; 杨洋; 于静; 杨鹏; 王志国; 张微; 赵长亮
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2020-10-27
Filing date: 2020-10-27
Publication date: 2023-08-22
Anticipated expiration: 2040-10-27
Also published as: CN114482949A

Abstract

The invention relates to a pressurizing water injection device, which comprises an outer pipe, an inner pipe and a movable rod, wherein a first check valve and a lower return joint which are communicated downwards are arranged in the inner pipe; the inner pipe is arranged in the outer pipe, the lower part of the inner pipe extends into the lower return joint, and a first water inlet hole, a second water inlet hole and a third water inlet hole which are communicated with each other are respectively formed in the outer pipe, the lower return joint and the inner pipe so as to form a water inlet channel; a water delivery channel is formed between the inner pipe and the outer pipe, a second water delivery hole is formed in the inner pipe, and the water delivery channel is communicated with the second water delivery hole and the first water delivery hole; the movable rod can be arranged in the inner tube in a sliding way, a second one-way valve which is communicated upwards is arranged at the bottom of the movable rod, a water delivery cavity is formed in the movable rod, and a third water delivery hole which is communicated with the water delivery cavity and the second water delivery hole is formed in the movable rod. The invention solves the technical problem of insufficient water injection pressure in the water injection well.

Description

Pressurizing water injection device

Technical Field

The invention relates to the technical field of oil extraction engineering, in particular to a pressurizing water injection device.

Background

At present, the development of the thin oil zone is mostly carried out by adopting a water injection development mode, the cost is limited, and a set of ground water injection system cannot be built for each water injection well, so that the water injection is carried out for a plurality of water injection wells simultaneously by adopting a concentrated water injection mode at present, and the condition of insufficient water injection pressure can occur due to concentrated water injection, so that the water injection pressure needs to be increased according to the actual condition, and the purpose of smooth water injection is achieved. In the long-term high-pressure water injection process, the high-pressure pipeline on the ground is influenced by water injection pressure to cause the condition of puncture leakage, so that normal water injection work is influenced, and pollution is brought to the environment. In addition, the water injection pressure required by each water injection well is different, but because the water injection is concentrated, the water injection in each water injection well comes from the same main pipeline, the water injection pressure for each water injection well is the same, the situation can lead to large water injection quantity in the water injection well with lower pressure and small water injection quantity in the water injection well with higher pressure, so that the water injection pressure is also required to be improved according to the actual situation, and the water injection quantity is ensured to be injected into the water injection well with higher pressure.

Aiming at the problem of insufficient water injection pressure into a water injection well in the related technology, no effective solution is proposed at present.

Therefore, the inventor provides a water injection well injection increasing device by virtue of experience and practice of related industries for many years so as to overcome the defects of the prior art.

Disclosure of Invention

The invention aims to provide a pressurizing water injection device, which can drive a water injection well injection increasing system to increase the injection pressure in a well by using a pumping unit on the premise of not changing the traditional ground water injection pipeline, so that the exploitation effect of the water injection well is improved, and the water injection pressure of a water injection main pipeline can be reduced within a certain range due to the increase of the injection pressure in the well, so that the possibility of puncture leakage of the water injection pipeline is reduced, and the service life of the water injection pipeline is prolonged.

The aim of the invention can be achieved by adopting the following technical scheme:

the invention provides a pressurized water injection device, which comprises an outer pipe, an inner pipe and a movable rod, wherein:

the lower part of the outer pipe is provided with a packer, the interior of the inner pipe is sequentially provided with a first one-way valve and a lower return joint which are communicated downwards from bottom to top, the lower return joint is of a cylindrical structure with an opening at the top and a sealing bottom, the lower return joint is provided with a first water delivery hole which is communicated with the space above the lower return joint and the space below the lower return joint, and the interior of the lower return joint is slidably provided with a first sealing joint;

The inner pipe is fixedly arranged in the outer pipe, the lower part of the inner pipe extends into the lower return joint, a first water inlet hole, a second water inlet hole and a third water inlet hole which are communicated with each other are respectively formed in the outer pipe, the lower return joint and the inner pipe so as to form a water inlet channel which is sealed and penetrates through the outer pipe, the lower return joint and the inner pipe in sequence, a water delivery channel is formed between the inner pipe and the outer pipe, a second water delivery hole is formed in the inner pipe, and the top and the bottom of the water delivery channel are respectively communicated with the second water delivery hole and the first water delivery hole; the movable rod is slidably arranged in the inner tube, a second one-way valve which is communicated upwards is arranged at the bottom of the movable rod, a water delivery cavity is formed in the movable rod above the second one-way valve, and a third water delivery hole which is communicated with the water delivery cavity and the second water delivery hole is formed in the movable rod;

when the outer pipe is put down into the water injection well, the first sealing joint seals the water inlet channel; when the inner pipe is lowered into the outer pipe, the bottom of the inner pipe is abutted with the top of the first sealing joint and pushes the first sealing joint to slide to the lower part of the water inlet channel, so that the water inlet channel is conducted.

In a preferred embodiment of the present invention, the number of the first water delivery holes is plural, each of the first water delivery holes extends along the axial direction of the lower return joint, and the first water delivery holes are uniformly distributed along the circumferential direction of the lower return joint.

In a preferred embodiment of the present invention, the outer tube includes a first outer connection tube, a second outer connection tube and a third outer connection tube sequentially connected from top to bottom, and the first outer connection tube, the second outer connection tube and the third outer connection tube are connected to each other, and the first outer connection tube is connected to the oil tube.

In a preferred embodiment of the present invention, the outer tube further includes an upper joint and a lower joint, the upper joint and the lower joint are both vertically arranged and have tubular structures with two open ends, the bottom of the upper joint is connected with the top of the first outer connecting tube, and the top of the upper joint is connected with the bottom of the oil tube; the top of the lower joint is connected with the bottom of the third outer connecting pipe, the bottom of the lower joint extends downwards to a position close to a stratum to be injected with water, and the packer is arranged on the outer wall of the lower joint.

In a preferred embodiment of the present invention, the first check valve includes a first valve seat, a first valve ball and a first valve plate, where the first valve seat is in an annular structure, the first valve seat and the first valve plate are both fixed inside the outer tube, and the first valve seat is located above the first valve plate, so as to form a first accommodating cavity between the first valve plate and the first valve seat, the first valve ball is movably disposed in the first accommodating cavity, and the top outer wall of the first valve ball can abut against the bottom inner edge of the first valve seat, and a plurality of first through holes communicated with the first accommodating cavity are formed on the first valve plate.

In a preferred embodiment of the present invention, the lower part of the third outer connecting pipe is sleeved outside the top of the lower joint, and a first positioning boss is arranged on the inner wall of the third outer connecting pipe;

the first check valve further comprises a first valve seat sleeve, the first valve seat sleeve is of an annular structure, the outer wall of the first valve seat sleeve is tightly attached to the inner wall of the third outer connecting pipe, the top and the bottom of the first valve seat sleeve are respectively in butt joint with the bottom of the first positioning boss and the top of the lower joint, the first valve seat is located the inner side of the first valve seat sleeve, an eighth positioning boss is arranged on the inner wall of the top of the first valve seat sleeve, the outer wall of the first valve seat is tightly attached to the inner wall of the first valve seat sleeve, and the top of the first valve seat is in butt joint with the bottom of the eighth positioning boss.

In a preferred embodiment of the present invention, at least one first sealing ring is disposed between the first valve seat sleeve and the third outer connecting pipe, and between the first valve seat and the first valve seat sleeve.

In a preferred embodiment of the present invention, the lower return joint is located inside the third outer connecting pipe, the bottom of the lower return joint is abutted against the top of the first positioning boss, and the outer wall of the lower return joint is closely attached to the inner wall of the third outer connecting pipe.

In a preferred embodiment of the present invention, a plurality of second sealing rings are disposed between the lower return joint and the third outer connecting pipe.

In a preferred embodiment of the present invention, the inner tube includes a first inner connecting tube, a second inner connecting tube, a third inner connecting tube, a fourth inner connecting tube and a fifth inner connecting tube sequentially connected from top to bottom, a lower portion of the fifth inner connecting tube extends into the lower return section from a top opening of the lower return section, an outer wall of the fifth inner connecting tube is closely attached to an inner wall of the lower return section, and a bottom of the fifth inner connecting tube is abutted to a top of the first sealing section; the water delivery channel is an annular channel positioned between the outer wall of the second outer connecting pipe, the inner wall of the third inner connecting pipe and the inner wall of the fourth inner connecting pipe, and the second water delivery hole is formed in the pipe wall of the fourth inner connecting pipe; the third water inlet is formed in the pipe wall of the fifth inner connecting pipe, the first water inlet is formed in the pipe wall of the third outer connecting pipe, and the first water inlet, the second water inlet and the third water inlet are sequentially communicated.

In a preferred embodiment of the present invention, a plurality of third sealing rings are disposed between the fifth inner connecting pipe and the lower return joint, and each of the third sealing rings is located above and below the third water inlet hole.

In a preferred embodiment of the present invention, the inner pipe further includes a lifting nipple, the lifting nipple is a cylindrical structure with two ends open, the bottom of the lifting nipple is connected with the top of the first inner connecting pipe, and a clamping boss capable of being clamped with the elevator in a matching manner is provided on the outer wall of the lifting nipple.

In a preferred embodiment of the present invention, a rubber cylinder, an upper bracket, a lower bracket and a second sealing joint are disposed between the first inner connecting pipe and the first outer connecting pipe, the upper bracket and the lower bracket are both in an annular structure, the second sealing joint is in a cylindrical structure with two ends open, the upper bracket, the rubber cylinder and the lower bracket are sequentially sleeved outside the first inner connecting pipe from top to bottom, the top and the bottom of the rubber cylinder are respectively abutted to the bottom of the upper bracket and the top of the lower bracket, the second sealing joint is sleeved outside the rubber cylinder, and the outer wall of the second sealing joint is tightly attached to the inner wall of the first outer connecting pipe.

In a preferred embodiment of the present invention, the top of the first outer connecting pipe is sleeved outside the bottom of the upper joint, a second positioning boss is provided on the inner wall of the first outer connecting pipe, and the top and the bottom of the second sealing joint are respectively abutted with the bottom of the upper joint and the top of the second positioning boss.

In a preferred embodiment of the present invention, at least one fifth sealing ring is disposed between the second sealing joint and the first outer connecting pipe; at least one sixth sealing ring is arranged between the lower bracket and the first connecting pipe.

In a preferred embodiment of the present invention, a coupling cylinder is sleeved on the outer side of the lower portion of the first inner connecting pipe and the outer side of the upper portion of the second inner connecting pipe, the inner wall of the upper portion and the inner wall of the lower portion of the coupling cylinder are respectively connected with the outer wall of the lower portion of the first inner connecting pipe and the outer wall of the upper portion of the second inner connecting pipe, the top of the coupling cylinder is abutted with the bottom of the lower bracket, the bottom of the coupling cylinder is abutted with the top of the supporting ring, a third positioning boss is arranged on the outer wall of the second inner connecting pipe, the outer wall of the lower portion of the supporting ring is abutted with the top of the third positioning boss, a fourth positioning boss is arranged on the inner wall of the first outer connecting pipe, the supporting ring is sleeved on the outer side of the second inner connecting pipe, the inner wall of the supporting ring is tightly abutted with the outer wall of the second inner connecting pipe, and the bottom of the supporting ring is abutted with the top of the fourth positioning boss;

The outside cover of second interconnection takeover is equipped with the jump ring, the jump ring is by the bellmouth form structure of supreme diameter increase gradually down, the bottom of jump ring is fixed in on the outer wall of second interconnection takeover, the top of jump ring with the bottom butt of fourth location boss.

In a preferred embodiment of the present invention, the top of the third inner connecting pipe is sleeved outside the bottom of the second inner connecting pipe, a fifth positioning boss is provided on the outer wall of the second inner connecting pipe, a sixth positioning boss is provided on the inner wall of the lower part of the snap spring, the top of the sixth positioning boss is abutted with the bottom of the fifth positioning boss, and the bottom of the snap spring is abutted with the top of the third inner connecting pipe.

In a preferred embodiment of the present invention, the lower outer wall of the supporting ring has an inverted cone structure with a gradually increasing diameter from bottom to top.

In a preferred embodiment of the present invention, the moving rod includes a sucker rod joint, a connecting rod, a connecting sleeve and a plunger sequentially connected from top to bottom, the connecting rod is a vertically arranged column structure, the sucker rod joint, the connecting sleeve and the plunger are all vertically arranged and have cylindrical structures with two open ends, a concave portion is formed at the bottom of the connecting rod, a third water delivery hole is formed on the inner wall of the concave portion and is opposite to the second water delivery hole, the concave portion, the interior of the connecting sleeve and the interior space of the plunger sequentially penetrate from top to bottom to form the water delivery cavity, the top of the sucker rod joint is connected to the bottom of the sucker rod, and the second one-way valve is arranged at the bottom of the plunger;

The outer wall of the connecting rod above the third water delivery hole is sealed with the inner wall of the third inner connecting pipe and can be connected in a sliding mode, and the outer wall of the plunger is sealed with the inner wall of the fourth inner connecting pipe and can be connected in a sliding mode.

In a preferred embodiment of the present invention, the second check valve includes a second valve seat, a second valve seat sleeve and a second valve ball, where the second valve seat is in an annular structure, the second valve seat sleeve is in a cylindrical structure with two ends open, the top of the second valve seat sleeve is connected with the bottom of the plunger, the second valve seat is disposed in the second valve seat sleeve, a second valve plate is disposed in the second valve seat sleeve and above the second valve seat, a second accommodating cavity is formed between the second valve plate and the second valve seat, the second valve ball is movably disposed in the second accommodating cavity, the bottom outer wall of the second valve ball can abut against the top inner side edge of the second valve seat, and a plurality of second through holes communicating the second accommodating cavity with the plunger are formed on the second valve plate.

In a preferred embodiment of the present invention, the second one-way valve further includes a pressure ring, the upper portion of the pressure ring is located inside the second valve seat sleeve, the outer wall of the upper portion of the pressure ring is connected with the inner wall of the lower portion of the second valve seat sleeve, a seventh positioning boss is disposed on the inner wall of the second valve seat sleeve located above the pressure ring, and the top and the bottom of the second valve seat are respectively abutted to the bottom of the seventh positioning boss and the top of the pressure ring.

In a preferred embodiment of the present invention, the first sealing joint is a cylindrical structure with two ends open, and the outer wall of the first sealing joint is closely attached to the inner wall of the lower return joint.

In a preferred embodiment of the present invention, a plurality of fourth sealing rings are disposed between the first sealing joint and the lower return joint.

From the above, the booster water injection device of the invention has the characteristics and advantages that:

the water injection is carried out from the ground to the water injection well in the use, after reaching certain water injection quantity, the injected water enters into the inner space between the inner pipe and the lower return joint through the water inlet channel, when the control movable rod moves upwards, the inner space of the inner pipe above the lower return joint is continuously increased and the pressure is continuously reduced, the injected water continuously enters into the inner space between the inner pipe and the lower return joint under the action of pressure difference, when the control movable rod moves downwards, the inner space between the lower return joint and the second check valve is continuously reduced, the inner pressure is continuously increased, when reaching the opening pressure of the second check valve, the injected water pushes the second check valve to open the inner space of the inner pipe above the second check valve, and sequentially passes through the third water delivery hole, the second water delivery hole, the water delivery channel and the first water delivery hole to enter into the inner space of the outer pipe above the first check valve, when the pressure reaches the opening pressure of the first check valve, the injected water pushes the first oil layer to be opened, the injected water is injected into the water injection well to be injected into the water injection well, the water injection well is boosted, and then the water injection well is injected into the water injection well is increased, and the water injection well is injected into the water well is pumped into the water well.

Because the pressurizing water injection device pressurizes the injected water in the injection well, the ground pipeline equipment is not required to be regulated, and the water injection pressure of the water injection pipeline on the ground is not required to be increased, so that the water injection pressure born by the water injection pipeline can be reduced within a certain range, the condition that the water injection pipeline is punctured and leaked is reduced, the pollution to the surrounding environment can be avoided, the service life of the water injection pipeline is prolonged, and the normal operation of oil extraction is ensured.

The invention firstly enters the outer pipe into the water injection well, then the assembled inner pipe and the moving rod are lowered into the outer pipe, a first sealing joint for sealing the water inlet channel is arranged in the outer pipe in the process of lowering the outer pipe, so that the pollution to the interior of the outer pipe in the process of lowering the outer pipe is prevented, when the inner pipe and the moving rod are lowered, the bottom of the inner pipe can push the first sealing joint to the lower part of the water inlet channel, so that the first sealing joint is staggered with the water inlet channel, the conduction of the water inlet channel is controlled, and the normal use of the supercharging water injection device is ensured.

Drawings

The following drawings are only for purposes of illustration and explanation of the present invention and are not intended to limit the scope of the invention.

Wherein:

Fig. 1: the structure of the pressurizing water injection device is schematically shown.

Fig. 2: an enlarged view of part of the a position in fig. 1.

Fig. 3: an enlarged view of part of the D position in fig. 2.

Fig. 4: an enlarged view of part of the B position in fig. 1.

Fig. 5: an enlarged view of part of the C position in fig. 1.

Fig. 6: the structure of the outer tube in the pressurizing water injection device is schematically shown.

Fig. 7: the structure of the inner tube and the movable rod in the pressurizing water injection device is schematically shown.

The reference numerals in the invention are:

1. an outer tube; 101. A first water inlet hole;

102. an upper joint; 103. A first outer connection tube;

1031. a second positioning boss; 1032. A fourth positioning boss;

104. a second outer connection pipe; 105. A third outer connection tube;

1051. a first positioning boss; 106. A lower joint;

2. an inner tube; 201. A third water inlet hole;

202. a second water delivery hole; 203. Lifting the nipple;

2031. clamping and hanging the boss; 204. A first inner connecting tube;

2041. a rubber cylinder; 2042. An upper bracket;

2043. a lower bracket; 2044. A second seal joint;

205. A second inner connecting tube; 2051. A third positioning boss;

2052. a fifth positioning boss; 206. A third inner connecting tube;

207. a fourth interconnecting pipe; 208. A fifth interconnecting pipe;

209. a coupling barrel; 3. A moving rod;

301. a water delivery cavity; 302. A third water delivery hole;

303. a sucker rod joint; 304. A connecting rod;

3041. a concave portion; 305. Connecting sleeves;

306. a plunger; 4. A packer;

5. a first one-way valve; 501. A first valve seat;

502. a first valve seat cover; 5021. An eighth positioning boss;

503. a first valve ball; 504. A first valve plate;

5041. a first through hole; 505. A first accommodation chamber;

6. a lower return section; 601. A first water delivery hole;

7. a water delivery channel; 8. A second one-way valve;

801. a second valve seat; 802. A second valve seat cover;

8021. a seventh positioning boss; 803. A second valve ball;

804. A second valve plate; 8041. A second through hole;

805. a second accommodation chamber; 806. A compression ring;

9. a first seal joint; 10. A first seal ring;

11. a second seal ring; 12. A third seal ring;

13. a fourth seal ring; 14. A fifth seal ring;

15. a sixth seal ring; 16. A support ring;

17. clamping springs; 1701. And a sixth positioning boss.

Detailed Description

For a clearer understanding of technical features, objects, and effects of the present invention, a specific embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in fig. 1 to 7, the present invention provides a pressurized water injection device, which is disposed at the bottom of an oil pipe, and is lowered into a water injection well along with the oil pipe to be located above and near a to-be-injected oil layer. The pressurizing water injection device comprises an outer pipe 1, an inner pipe 2 and a movable rod 3, wherein the outer pipe 1 and the inner pipe 2 are of cylindrical structures with openings at two ends, the top of the outer pipe 1 is connected to the bottom of an oil pipe, a packer 4 is arranged on the outer wall of the lower part of the outer pipe 1, an annulus between the outer wall of the outer pipe 1 and the inner wall of a water injection well can be subjected to seat sealing through the packer 4, a first one-way valve 5 which is communicated unidirectionally from top to bottom and a lower return joint 6 which seals the inner space of the inner pipe 2 are sequentially arranged in the inner pipe 2 from bottom to top, the lower return joint 6 is of a cylindrical structure with an opening at the top and a sealing bottom, a first water delivery hole 601 which is used for communicating the space above the lower return joint 6 with the space below the lower return joint 6 is arranged on the lower return joint 6, and a first sealing joint 9 is slidably arranged in the lower return joint 6; the inner tube 2 is fixedly arranged in the outer tube 1, the upper outer wall of the inner tube 2 is in sealing connection with the upper inner wall of the outer tube 1, the lower part of the inner tube 2 extends into the lower return joint 6 from the top opening of the lower return joint 6, the outer wall of the inner tube 2 is in sealing connection with the inner wall of the lower return joint 6, the outer tube 1 is provided with a first water inlet hole 101 communicated with each other, the lower return joint 6 is provided with a second water inlet hole (not shown), the inner tube 2 is provided with a third water inlet hole 201, the first water inlet hole 101, the second water inlet hole and the third water inlet hole 201 are positioned at the communicated positions to form a water inlet channel which is sealed and sequentially penetrates through the outer tube 1, the lower return joint 6 and the inner tube 2, a water delivery channel 7 is formed between the outer wall of the inner tube 2 above the lower return joint 6 and the inner wall of the outer tube 1, the inner tube 2 is provided with a second water delivery hole 202 above the water delivery channel, the top of the water delivery channel 7 is communicated with the second water delivery hole 202, and the bottom of the water delivery channel 7 is communicated with the first water delivery hole 601; the movable rod 3 is slidably arranged in the inner tube 2, the outer wall of the movable rod 3 is in sealing connection with the inner wall of the inner tube 2, the bottom of the movable rod 3 is provided with a second one-way valve 8 which is in one-way conduction from bottom to top, a water delivery cavity 301 is formed in the movable rod 3 above the second one-way valve 8, and a third water delivery hole 302 which is communicated with the water delivery cavity 301 and the second water delivery hole 202 is formed in the movable rod 3; in the process of putting the pressurizing water injection device into the water injection well, firstly putting down the outer pipe 1 into the water injection well, then putting down the assembled inner pipe 2 and the moving rod 3 into the outer pipe 1, and when the outer pipe 1 is put down, the first sealing joint 9 is positioned at a position for plugging a water inlet channel; when the inner pipe 2 is lowered, the bottom of the inner pipe 2 is abutted with the top of the first sealing joint 9 and pushes the first sealing joint 9 to slide below the water inlet channel, so that the water inlet channel is conducted.

The invention is used for injecting water into the water injection well from the ground in the process of use, and a certain water injection quantity is achieved (namely, the water injection quantity of the injected water reaches the position of a water inlet channel in the water injection well), then the injected water enters the inner space between the inner pipe 2 and the lower return joint 6 through the water inlet channel, when the control moving rod 3 moves upwards, the inner space of the inner pipe 2 above the lower return joint 6 is continuously increased and the pressure intensity is continuously reduced, under the action of pressure difference, the injected water continuously enters the inner space between the inner pipe 2 and the lower return joint 6, when the control moving rod 3 moves downwards, the inner space between the lower return joint 6 and the second one-way valve 8 is continuously reduced, the inner pressure intensity is continuously increased, and when the opening pressure of the second one-way valve 8 is reached, the injected water pushes the second one-way valve 8 to enter the inner space of the inner pipe 2 above the second one-way valve 8, and sequentially passes through the third water inlet hole 302, the second water inlet hole 202, the water inlet channel 7 and the first water inlet layer 601 to enter the inner space of the inner pipe 1 above the first one-way valve 5, when the pressure of the water injection hole is increased, the water injection hole is opened after the pressure of the water injection hole is opened, the pressure of the injected water is increased, and the injected water injection hole is injected into the one-way hole is increased, and the water injection hole is filled after the pressure is increased, and the pressure is injected into the water hole is increased, and the water injection hole is filled. Because the pressurizing water injection device pressurizes the injected water in the injection well, the ground pipeline equipment is not required to be regulated, and the water injection pressure of the water injection pipeline on the ground is not required to be increased, so that the water injection pressure born by the water injection pipeline can be reduced within a certain range, the condition that the water injection pipeline is punctured and leaked is reduced, the pollution to the surrounding environment can be avoided, the service life of the water injection pipeline is prolonged, and the normal operation of oil extraction is ensured. In addition, the outer pipe 1 is firstly put into the water injection well, then the assembled inner pipe 2 and the moving rod 3 are put into the outer pipe 1, the first sealing joint 9 for sealing the water inlet channel is arranged in the outer pipe 1 in the process of putting into the outer pipe 1, so that the pollution to the inner part of the outer pipe 1 caused by oil liquid and sediment in the water injection well in the process of putting into the water injection well is prevented, when the inner pipe 2 and the moving rod 3 are put into the water injection well, the bottom of the inner pipe 2 can push the first sealing joint 9 to the lower part of the water inlet channel, so that the first sealing joint 9 is staggered with the water inlet channel, the conduction of the water inlet channel is controlled, and the normal use of the pressurizing water injection device is ensured.

Further, the number of the first water delivery holes 601 is plural, each first water delivery hole 601 extends along the axial direction of the lower return joint 6, and the first water delivery holes 601 are uniformly distributed along the circumferential direction of the lower return joint 6. Sufficient conveying channels are provided for the injected water, and the injected water in the water conveying channel 7 is ensured to smoothly enter the inner space of the outer tube 1 above the first one-way valve 5 under the action of pressure, so that the first one-way valve 5 is ensured to be smoothly opened and the oil layer is ensured to be smoothly injected with water.

In an alternative embodiment of the present invention, as shown in fig. 1 to 6, the outer tube 1 includes a first outer connection tube 103, a second outer connection tube 104 and a third outer connection tube 105 connected in sequence from top to bottom, the first outer connection tube 103, the second outer connection tube 104 and the third outer connection tube 105 are all connected by threads, and the interiors of the first outer connection tube 103, the second outer connection tube 104 and the third outer connection tube 105 are communicated, and the first outer connection tube 103 is connected with an oil tube.

Further, as shown in fig. 1 and 2, the outer tube 1 further includes an upper joint 102, the upper joint 102 is a cylindrical structure with two ends open, the bottom of the upper joint 102 is in threaded connection with the top of the first outer connecting tube 103, the top of the upper joint 102 is in threaded connection with the bottom of the oil tube, and the upper joint 102 is convenient for installing and dismantling between the outer tube 1 and the oil tube.

Further, as shown in fig. 1, the outer tube 1 further includes a lower joint 106, the lower joint 106 is a cylindrical structure with two ends open, the top of the lower joint 106 is in threaded connection with the bottom of the third outer connecting tube 105, the bottom of the lower joint 106 extends downwards to a position close to the stratum to be injected with water, and the packer 4 is fixedly arranged on the outer wall of the lower joint 106.

In an alternative embodiment of the present invention, as shown in fig. 1 and 5, the first check valve 5 includes a first valve seat 501, a first valve ball 503 and a first valve plate 504, where the first valve seat 501 is an annular structure disposed along a radial direction of the water injection well, the first valve seat 501 and the first valve plate 504 are both fixed inside the outer tube 1, and the first valve seat 501 is located above the first valve plate 504, so as to form a first accommodating cavity 505 between the first valve plate 504 and the first valve seat 501, a diameter of the first valve ball 503 is greater than an inner diameter of the first valve seat 501 and a diameter of the first valve ball 503 is smaller than a diameter of the first accommodating cavity 505, so that the first valve ball 503 is movably disposed in the first accommodating cavity 505, and a top outer wall of the first valve ball 503 can abut against a bottom inner side edge of the first valve seat 501, thereby preventing the first valve ball 503 from separating from the first accommodating cavity 505, a plurality of first through holes 5041 communicating with the first oil layer accommodating cavity 505 are formed on the first valve plate 504, and after the first check valve 5 is opened, water is injected into the first through holes 5041 to the lower than the first check valve 5.

Further, as shown in fig. 1 and 5, the lower part of the third outer connecting pipe 105 is sleeved outside the top of the lower joint 106, and an annular first positioning boss 1051 is arranged on the inner wall of the third outer connecting pipe 105 along the circumferential direction of the third outer connecting pipe 105; in addition, the first check valve 5 further includes a first valve seat sleeve 502, the first valve seat sleeve 502 is of a circular ring structure, the outer wall of the first valve seat sleeve 502 is tightly attached to the inner wall of the third outer connecting pipe 105, the top of the first valve seat sleeve 502 is abutted to the bottom of the first positioning boss 1051, the bottom of the first valve seat sleeve 502 is abutted to the top of the lower joint 106, the first valve seat 501 is located inside the first valve seat sleeve 502, an eighth positioning boss 5021 of a circular ring shape is arranged on the inner wall of the top of the first valve seat sleeve 502 along the circumferential direction of the first valve seat sleeve 502, the outer wall of the first valve seat 501 is tightly attached to the inner wall of the first valve seat sleeve 502, the top of the first valve seat 501 is abutted to the bottom of the eighth positioning boss 5021, and the first valve seat sleeve 502 is matched with the lower joint 106 to fix the first valve seat 501, so that the first check valve 5 is firmly arranged inside the outer pipe 1 is ensured.

Further, as shown in fig. 5, at least one first sealing ring 10 is disposed between the first valve seat sleeve 502 and the third outer connecting pipe 105 and between the first valve seat 501 and the first valve seat sleeve 502, so as to ensure good tightness between the first valve seat sleeve 502 and the third outer connecting pipe 105 and between the first valve seat 501 and the first valve seat sleeve 502, ensure that injected water is injected into an oil layer through the first check valve 5 entirely, and avoid leakage of the injected water.

Further, as shown in fig. 5, the lower return joint 6 is located inside the third outer connecting pipe 105, the bottom of the lower return joint 6 is abutted with the top of the first positioning boss 1051, the outer wall of the lower return joint 6 is tightly attached to the inner wall of the third outer connecting pipe 105, and the first positioning boss 1051 plays a role in supporting and limiting the lower return joint 6, so that the position of the lower return joint 6 in the outer pipe 1 is ensured to be stable.

Further, a plurality of second sealing rings 11 are arranged between the lower return joint 6 and the third outer connecting pipe 105, so that good sealing performance between the lower return joint 6 and the third outer connecting pipe 105 is ensured, and leakage of injected water is prevented.

In an alternative embodiment of the present invention, as shown in fig. 1 to 5, the inner tube 2 includes a first inner connecting tube 204, a second inner connecting tube 205, a third inner connecting tube 206, a fourth inner connecting tube 207 and a fifth inner connecting tube 208 connected in this order from top to bottom, the first inner connecting tube 204, the second inner connecting tube 205, the third inner connecting tube 206, the fourth inner connecting tube 207 and the fifth inner connecting tube 208 are connected by threads, the lower part of the fifth inner connecting tube 208 extends into the inside of the lower return joint 6 from the top opening of the lower return joint 6, the outer wall of the fifth inner connecting tube 208 is tightly attached to the inner wall of the lower return joint 6, and the bottom of the fifth inner connecting tube 208 is abutted to the top of the first seal joint 9; the water delivery channel 7 is an annular channel between the outer wall of the second outer connecting pipe 104 and the inner wall of the third inner connecting pipe 206 and the inner wall of the fourth inner connecting pipe 207, and the second water delivery hole 202 is formed on the pipe wall of the fourth inner connecting pipe 207; the third water inlet 201 is formed on the wall of the fifth inner connecting pipe 208, the first water inlet 101 is formed on the wall of the third outer connecting pipe 105, and the first water inlet 101, the second water inlet and the third water inlet 201 are sequentially communicated from outside to inside.

Further, as shown in fig. 5, a plurality of third sealing rings 12 are disposed between the fifth inner connecting pipe 208 and the lower return joint 6, each third sealing ring 12 is located above and below the third water inlet 201, and good sealing performance can be ensured by each third sealing ring 12 between the fifth inner connecting pipe 208 and the lower return joint 6 and above and below the third water inlet 201, so as to avoid leakage of injected water.

Further, as shown in fig. 1 and 2, the inner pipe 2 further includes a lifting nipple 203, the lifting nipple 203 is of a cylindrical structure with vertical arrangement and two open ends, the bottom of the lifting nipple 203 is in threaded connection with the top of the first inner connecting pipe 204, an annular clamping boss 2031 is arranged on the outer wall of the lifting nipple 203 along the circumferential direction of the lifting nipple 203, and the lifting boss 2031 can be clamped with an elevator in a matched manner, so that the inner pipe 2 is conveniently lowered and lifted, and the lifting pipe is suitable for on-site implementation.

In an alternative embodiment of the present invention, as shown in fig. 2 and 3, a rubber tube 2041, an upper bracket 2042, a lower bracket 2043 and a second sealing joint 2044 are disposed between the first inner connecting tube 204 and the first outer connecting tube 103, the upper bracket 2042 and the lower bracket 2043 are both annular structures disposed along the radial direction of the first outer connecting tube 103, the second sealing joint 2044 is a cylindrical structure with two ends open, the upper bracket 2042, the rubber tube 2041 and the lower bracket 2043 are sequentially sleeved outside the first inner connecting tube 204 from top to bottom, the top of the rubber tube 2041 is abutted with the bottom of the upper bracket 2042, the bottom of the rubber tube 2041 is abutted with the top of the lower bracket 2043, the second sealing joint 2044 is sleeved outside the rubber tube 2041, and the outer wall of the second sealing joint 2044 is tightly attached to the inner wall of the first outer connecting tube 103. In the working process, the upper bracket 2042 and the lower bracket 2043 cooperate to position the rubber tube 2041, the upper bracket 2042 and the lower bracket 2043 cooperate to squeeze the rubber tube 2041 to expand the rubber tube 2041, the rubber tube 2041 cooperates with the second sealing joint 2044 to achieve a good sealing effect between the first outer connecting pipe 103 and the first inner connecting pipe 204, and no injected water is ensured to leak from between the first outer connecting pipe 103 and the first inner connecting pipe 204, so that the water injection operation is ensured to be smoothly carried out.

Further, as shown in fig. 1 to 3, the top of the first outer connecting pipe 103 is sleeved on the outer side of the bottom of the upper joint 102, an annular second positioning boss 1031 is disposed on the inner wall of the first outer connecting pipe 103 along the circumferential direction of the first outer connecting pipe 103, the top of the second sealing joint 2044 is abutted with the bottom of the upper joint 102, the bottom of the second sealing joint 2044 is abutted with the top of the second positioning boss 1031, and the second sealing joint 2044 is positioned by the cooperation of the upper joint 102 and the second positioning boss 1031, so that the second sealing joint 2044 is ensured to be stably disposed inside the first outer connecting pipe 103.

Further, as shown in fig. 3, at least one fifth sealing ring 14 is disposed between the second sealing joint 2044 and the first outer connecting pipe 103, and good tightness between the second sealing joint 2044 and the first outer connecting pipe 103 is ensured by the fifth sealing ring 14; at least one sixth sealing ring 15 is arranged between the lower bracket 2043 and the first inner connecting pipe 204, and good sealing performance between the lower bracket 2043 and the first inner connecting pipe 204 is ensured through the sixth sealing ring 15, so that the sealing effect of the rubber tube 2041 and the second sealing joint 2044 is further improved.

In an alternative embodiment of the present invention, as shown in fig. 1 and 2, a coupling cylinder 209 is sleeved on the outer side of the lower portion of the first inner connecting pipe 204 and the outer side of the upper portion of the second inner connecting pipe 205, the coupling cylinder 209 is a cylindrical structure with two ends open, the upper inner wall of the coupling cylinder 209 is in threaded connection with the lower outer wall of the first inner connecting pipe 204, the lower inner wall of the coupling cylinder 209 is in threaded connection with the upper outer wall of the second inner connecting pipe 205, the top of the coupling cylinder 209 is abutted with the bottom of the lower bracket 2043, the bottom of the coupling cylinder 209 is abutted with the top of the supporting ring 16, a third positioning boss 2051 with a circular ring shape is arranged on the outer wall of the second inner connecting pipe 205 along the circumferential direction of the second inner connecting pipe 205, a fourth positioning boss 1032 with a circular ring shape is arranged on the inner wall of the first outer connecting pipe 103 along the circumferential direction of the first outer connecting pipe 103, the supporting ring 16 is sleeved on the outer side of the second inner connecting pipe 205, the inner wall of the supporting ring 16 is abutted with the bottom of the second supporting ring 205, and the bottom of the supporting ring 1032 is abutted with the top of the fourth positioning boss; the outside cover of second interior connecting pipe 205 is equipped with jump ring 17, and jump ring 17 is the horn mouth form structure that increases gradually from bottom to top diameter, and the bottom of jump ring 17 is fixed in on the outer wall of second interior connecting pipe 205, the top butt of jump ring 17 and the bottom of fourth location boss 1032. The fourth positioning boss 1032 is positioned by matching the clamp spring 17 with the support ring 16, so that the inner tube 2 can be fixed on the inner wall of the outer tube 1 after the inner tube 2 is lowered into the preset position in the outer tube 1.

Specifically, as shown in fig. 2, the top of the third inner connecting pipe 206 is sleeved on the outer side of the bottom of the second inner connecting pipe 205, a circular fifth positioning boss 2052 is provided on the outer wall of the second inner connecting pipe 205 along the circumferential direction of the second inner connecting pipe 205, a circular sixth positioning boss 1701 is provided on the lower inner wall of the clamp spring 17 along the circumferential direction of the clamp spring 17, the top of the sixth positioning boss 1701 is abutted with the bottom of the fifth positioning boss 2052, and the bottom of the clamp spring 17 is abutted with the top of the third inner connecting pipe 206. The clamp spring 17 is fixed to the outer wall of the second inner connecting tube 205 by the cooperation of the sixth positioning boss 1701, the fifth positioning boss 2052 and the third inner connecting tube 206.

Further, the snap spring 17 may be made of, but not limited to, spring steel.

Further, as shown in fig. 2, the lower outer wall of the supporting ring 16 has an inverted cone structure with a gradually increasing diameter from bottom to top. In the process of putting the inner tube 2 into the outer tube 1, the contact area between the support ring 16 and the fourth positioning boss 1032 is increased, so that a certain buffer effect is achieved, and the support ring 16 and the fourth positioning boss 1032 are prevented from being damaged due to overlarge impact force.

In an alternative embodiment of the present invention, as shown in fig. 1 to 5, the moving rod 3 includes a pumping rod joint 303, a connecting rod 304, a connecting sleeve 305 and a plunger 306 sequentially connected from top to bottom, the pumping rod joint 303, the connecting rod 304, the connecting sleeve 305 and the plunger 306 are all connected by threads, the connecting rod 304 is a cylindrical structure vertically arranged, the pumping rod joint 303, the connecting sleeve 305 and the plunger 306 are all cylindrical structures vertically arranged and open at two ends, the middle position of the bottom of the connecting rod 304 is recessed towards the inner side of the connecting rod 304 to form a cylindrical concave portion 3041, a third water delivery hole 302 is formed on the inner wall of the concave portion 3041 and is opposite to the second water delivery hole 202, the concave portion 3041, the inside of the connecting sleeve 305 and the inner space of the plunger 306 sequentially penetrate from top to bottom to form a water delivery cavity 301, the top of the pumping rod joint 303 is in threaded connection with the bottom of the pumping rod, and the second one-way valve 8 is arranged at the bottom of the plunger 306; the outer wall of the connecting rod 304 located above the third water delivery hole 302 is sealed and slidably connected with the inner wall of the third inner connecting tube 206, and the outer wall of the plunger 306 is sealed and slidably connected with the inner wall of the fourth inner connecting tube 207.

In an alternative embodiment of the present invention, as shown in fig. 1 and 4, the second check valve 8 includes a second valve seat 801, a second valve seat sleeve 802, and a second valve ball 803, where the second valve seat 801 is a circular ring structure disposed along a radial direction of the water injection well, the second valve seat sleeve 802 is a cylindrical structure with two ends open, the top of the second valve seat sleeve 802 is in threaded connection with the bottom of the plunger 306, the second valve seat 801 is disposed in the second valve seat sleeve 802, a second valve plate 804 is disposed in the second valve seat sleeve 802 and above the second valve seat 801, a second accommodating cavity 805 is formed between the second valve plate 804 and the second valve seat 801, the diameter of the second valve ball 803 is larger than the inner diameter of the second valve seat 801, and the diameter of the second valve ball 803 is smaller than the diameter of the second accommodating cavity 805, so that the second valve ball 803 can be movably disposed in the second accommodating cavity 805, and the bottom outer wall of the second valve ball 803 can abut against the top inner side edge of the second valve seat 801, so that the second valve seat 803 can avoid water from flowing into the second valve seat 803 through the second check valve seat 80 through the second valve seat 80, and the second check valve seat 80 is opened, and the check valve 80 is opened.

Further, the second valve seat cover 802 and the second valve plate 804 are integrally formed.

Further, as shown in fig. 4, the second check valve 8 further includes a pressing ring 806, the pressing ring 806 is a circular ring structure disposed along a radial direction of the second valve seat cover 802, an upper portion of the pressing ring 806 is located inside the second valve seat cover 802, an outer wall of an upper portion of the pressing ring 806 is connected with an inner wall of a lower portion of the second valve seat cover 802, a seventh positioning boss 8021 in a circular ring shape is disposed on an inner wall of the second valve seat cover 802 located above the pressing ring 806 along a circumferential direction of the second valve seat cover 802, and a top of the second valve seat 801 is abutted with a bottom of the seventh positioning boss 8021, and a bottom of the second valve seat 801 is abutted with a top of the pressing ring 806. The second valve seat 801 is fixed by a compression ring 806, so that the second valve ball 803 is ensured to be positioned in the second accommodating cavity 805.

In an alternative embodiment of the present invention, as shown in fig. 5, the first sealing joint 9 is a cylindrical structure with two ends open, and the outer wall of the first sealing joint 9 is closely attached to the inner wall of the lower return joint 6, so as to ensure that the water inlet channel can be plugged when the first sealing joint 9 is located opposite to the water inlet channel.

Further, as shown in fig. 5, a plurality of fourth sealing rings 13 are arranged between the first sealing joint 9 and the lower return joint 6, and good sealing effect between the first sealing joint 9 and the lower return joint 6 is ensured by the fourth sealing rings 13.

The charging process of the pressurizing water injection device comprises the following steps: firstly, the outer pipe 1 shown in fig. 6 is connected with the packer 4 and then is lowered into a preset position in the water injection well along with the oil pipe, and pressure liquid is injected into the water injection well, so that the packer 4 forms a seat seal in an annulus. As shown in fig. 7, the inner pipe 2 and the movable rod 3 are assembled, and the lift sub 203 is lifted by the elevator, so that the inner pipe 2 and the movable rod 3 are lowered into the water injection well together, and the first sealing joint 9 is located at a position opposite to the second water inlet hole, so as to seal the water inlet channel. After the inner pipe 2 and the movable rod 3 are put into the water injection well together, the bottom of the sucker rod is connected with the top of the movable rod 3, the elevator is converted to the sucker rod and the sucker rod is lifted up to reduce the height of the working machine, the working machine is controlled to put down the inner pipe 2 and the movable rod 3, in the process of lowering, when the clamping spring 17 on the second inner connecting pipe 205 moves down to the position of the fourth positioning boss 1032, the upper outer wall of the clamping spring 17 contracts towards the direction close to the second inner connecting pipe 205 under the action of the pressure of the fourth positioning boss 1032, and when the clamping spring 17 moves down to the position below the fourth positioning boss 1032, the upper part of the clamping spring 17 expands towards the direction away from the second inner connecting pipe 205 under the action of self-elastic force (namely, the upper part of the clamping spring 17 returns to the original position), at the moment, the bottom of the fourth positioning boss 1032 is just abutted with the top of the clamping spring 17, and the top of the fourth positioning boss 1032 is abutted with the lower outer wall of the supporting ring 16, so that the inner pipe 2 is integrally fixed in the inside of the pipe 1; in addition, in the process of lowering the inner pipe 2, the bottom of the inner pipe 2 (i.e. the bottom of the fifth inner connecting pipe 208) moves downwards to a position abutting against the top of the first sealing joint 9, the first sealing joint 9 is pressed to move downwards to the bottom of the lower return joint 6 under the action of the gravity of the sucker rod and the inner pipe 2, so that the position of the first sealing joint 9 is staggered from the position of the second liquid inlet hole, the third water inlet hole 201 on the fifth inner connecting pipe 208 is communicated with the second water inlet hole on the lower return joint 6 and the first water inlet hole 101 on the third outer connecting pipe 105, and the water inlet channel is communicated to finish the lowering operation of the pressurizing water injection device.

The water injection process of the pressurized water injection device comprises the following steps: after the pressurizing water injection device is put into a preset position, water is injected into the annulus from the ground, after the water injection quantity of the injected water reaches the position of a water inlet channel in a water injection well, a pumping unit is started at the moment, a sucker rod drives a movable rod 3 to integrally move upwards (a second one-way valve 8 moves upwards synchronously with the movable rod 3), the inner space of an inner pipe 2 below the second one-way valve 8 is continuously increased, the pressure intensity is continuously reduced, and the injected water enters the inner pipe 2 through the water inlet channel and is positioned in the space above a lower return joint 6 under the action of pressure difference; when the sucker rod drives the movable rod 3 to move downwards integrally, the pressure of the inner space of the inner tube 2 below the second one-way valve 8 is continuously increased, when the opening pressure of the second one-way valve 8 is reached, the injected water pushes the second one-way valve 8 open and enters the water delivery cavity 301 above the second one-way valve 8, and sequentially passes through the third water delivery hole 302, the second water delivery hole 202, the water delivery channel 7 and the first water delivery holes 601 to enter the inner space of the outer tube 1 above the first one-way valve 5, when the pressure reaches the opening pressure of the first one-way valve 5, the injected water pushes the first one-way valve 5 to open, and the pressurized injected water is sprayed from the first one-way valve 5 and injected into an oil layer to be injected. When the sucker rod drives the movable rod 3 to integrally move downwards, the pressure in the outer pipe 1 above the lower return joint 6 gradually decreases and is smaller than the pressure in the stratum, and then the first one-way valve 5 is closed under the action of the pressure in the stratum, so that the condition that injected water in the stratum is reversed is avoided.

The supercharging water injection device has the characteristics and advantages that:

1. the pressurizing water injection device pressurizes injected water in the water injection well and then injects the water into the oil layer to be injected, so that the injection pressure in the well is increased, and the exploitation effect of the water injection well can be effectively improved.

2. This pressure boost water injection device carries out the pressure boost to the injection water in the inside of water injection well, need not to adjust ground pipeline equipment, also need not to increase the water injection pressure of subaerial water injection pipeline, can reduce the water injection pressure that the water injection pipeline bore in certain limit, reduces the water injection pipeline and takes place the condition that the thorn leaks, not only can avoid causing the pollution to surrounding environment, has prolonged the life of water injection pipeline moreover, guarantees the normal clear of oil recovery work.

3. According to the pressurizing water injection device, the first sealing joint 9 for plugging the water inlet channel is arranged in the outer tube 1 in the process of being put into the outer tube 1, so that pollution to the interior of the outer tube 1 in the process of being put into is prevented, when the inner tube 2 and the movable rod 3 are put into the process, the bottom of the inner tube 2 can push the first sealing joint 9 to the lower part of the water inlet channel, so that the first sealing joint 9 is staggered with the water inlet channel, the water inlet channel is controlled to be conducted, and the normal use of the pressurizing water injection device is ensured.

The foregoing is illustrative of the present invention and is not to be construed as limiting the scope of the invention. Any equivalent changes and modifications can be made by those skilled in the art without departing from the spirit and principles of this invention, and are intended to be within the scope of this invention.

Claims

1. The utility model provides a pressure boost water injection device which characterized in that, pressure boost water injection device includes outer tube, inner tube and movable rod, wherein:

2. The pressurized-water injector according to claim 1, wherein the number of the first water delivery holes is plural, each of the first water delivery holes extends along the axial direction of the lower return joint, and the first water delivery holes are uniformly distributed along the circumferential direction of the lower return joint.

3. The pressurized-water injector according to claim 1, wherein said outer tube comprises a first outer connecting tube, a second outer connecting tube and a third outer connecting tube connected in sequence from top to bottom, and the interiors of said first outer connecting tube, said second outer connecting tube and said third outer connecting tube are communicated, and said first outer connecting tube is connected with an oil tube.

4. The pressurized water injection device according to claim 3, wherein the outer pipe further comprises an upper joint and a lower joint, the upper joint and the lower joint are vertically arranged and have cylindrical structures with two open ends, the bottom of the upper joint is connected with the top of the first outer connecting pipe, and the top of the upper joint is connected with the bottom of the oil pipe; the top of the lower joint is connected with the bottom of the third outer connecting pipe, the bottom of the lower joint extends downwards to a position close to a stratum to be injected with water, and the packer is arranged on the outer wall of the lower joint.

5. The pressurized-water injector according to claim 4, wherein the first check valve comprises a first valve seat, a first valve ball and a first valve plate, the first valve seat is of an annular structure, the first valve seat and the first valve plate are both fixed in the outer tube, the first valve seat is located above the first valve plate so as to form a first accommodating cavity between the first valve plate and the first valve seat, the first valve ball is movably arranged in the first accommodating cavity, the top outer wall of the first valve ball can be abutted against the bottom inner side edge of the first valve seat, and a plurality of first through holes communicated with the first accommodating cavity are formed in the first valve plate.

6. The pressurized-water injector according to claim 5, wherein the lower part of the third outer connecting pipe is sleeved outside the top of the lower joint, and a first positioning boss is arranged on the inner wall of the third outer connecting pipe;

7. The pressurized water injector of claim 6, wherein at least one first seal ring is disposed between said first valve seat sleeve and said third outer connecting tube and between said first valve seat and said first valve seat sleeve.

8. The pressurized-water injector according to claim 6, wherein said lower return joint is located inside said third outer connecting tube, the bottom of said lower return joint is abutted against the top of said first positioning boss, and the outer wall of said lower return joint is tightly attached to the inner wall of said third outer connecting tube.

9. The pressurized water injector of claim 8, wherein a plurality of second sealing rings are disposed between said lower return joint and said third outer connecting tube.

10. The pressurized-water injector according to claim 4, wherein said inner tube comprises a first inner connecting tube, a second inner connecting tube, a third inner connecting tube, a fourth inner connecting tube and a fifth inner connecting tube which are sequentially connected from top to bottom, the lower part of said fifth inner connecting tube extends into the interior of said lower return joint from the top opening of said lower return joint, the outer wall of said fifth inner connecting tube is closely attached to the inner wall of said lower return joint, and the bottom of said fifth inner connecting tube is abutted to the top of said first sealing joint; the water delivery channel is an annular channel positioned between the outer wall of the second outer connecting pipe, the inner wall of the third inner connecting pipe and the inner wall of the fourth inner connecting pipe, and the second water delivery hole is formed in the pipe wall of the fourth inner connecting pipe; the third water inlet is formed in the pipe wall of the fifth inner connecting pipe, the first water inlet is formed in the pipe wall of the third outer connecting pipe, and the first water inlet, the second water inlet and the third water inlet are sequentially communicated.

11. The pressurized-water injector according to claim 10, wherein a plurality of third sealing rings are provided between said fifth inner connecting tube and said lower return joint, each of said third sealing rings being located above and below said third water inlet hole, respectively.

12. The pressurized-water injector according to claim 10, wherein the inner pipe further comprises a lifting nipple, the lifting nipple is of a cylindrical structure with two ends open, the bottom of the lifting nipple is connected with the top of the first inner connecting pipe, and a clamping boss capable of being matched and clamped with the elevator is arranged on the outer wall of the lifting nipple.

13. The pressurized water injection device of claim 10, wherein a rubber cylinder, an upper bracket, a lower bracket and a second sealing joint are arranged between the first inner connecting pipe and the first outer connecting pipe, the upper bracket and the lower bracket are of annular structures, the second sealing joint is of a cylindrical structure with two ends being opened, the upper bracket, the rubber cylinder and the lower bracket are sequentially sleeved outside the first inner connecting pipe from top to bottom, the top and the bottom of the rubber cylinder are respectively abutted with the bottom of the upper bracket and the top of the lower bracket, the second sealing joint is sleeved outside the rubber cylinder, and the outer wall of the second sealing joint is tightly attached to the inner wall of the first outer connecting pipe.

14. The pressurized-water injector according to claim 13, wherein the top of the first outer connecting pipe is sleeved outside the bottom of the upper joint, a second positioning boss is arranged on the inner wall of the first outer connecting pipe, and the top and the bottom of the second sealing joint are respectively abutted with the bottom of the upper joint and the top of the second positioning boss.

15. The pressurized-water injector according to claim 13, wherein at least one fifth sealing ring is provided between said second sealing joint and said first outer connecting pipe; at least one sixth sealing ring is arranged between the lower bracket and the first connecting pipe.

16. The pressurized water injection device as described in claim 13 wherein a coupling cylinder is sleeved on the outer side of the lower part of said first inner connecting pipe and the outer side of the upper part of said second inner connecting pipe, the inner walls of the upper part and the lower part of said coupling cylinder are respectively connected with the outer walls of the lower part of said first inner connecting pipe and the outer walls of the upper part of said second inner connecting pipe, the top of said coupling cylinder is abutted with the bottom of said lower bracket, the bottom of said coupling cylinder is abutted with the top of a supporting ring, a third positioning boss is arranged on the outer wall of said second inner connecting pipe, the outer wall of said supporting ring is abutted with the top of said third positioning boss, a fourth positioning boss is arranged on the inner wall of said first outer connecting pipe, said supporting ring is sleeved on the outer side of said second inner connecting pipe, the inner wall of said supporting ring is tightly abutted with the outer wall of said second inner connecting pipe, and the bottom of said supporting ring is abutted with the top of said fourth positioning boss;

17. The pressurized-water injector according to claim 16, wherein the top of the third connecting pipe is sleeved outside the bottom of the second connecting pipe, a fifth positioning boss is arranged on the outer wall of the second connecting pipe, a sixth positioning boss is arranged on the inner wall of the lower part of the clamp spring, the top of the sixth positioning boss is abutted with the bottom of the fifth positioning boss, and the bottom of the clamp spring is abutted with the top of the third connecting pipe.

18. The pressurized-water injector according to claim 16, wherein the lower outer wall of said support ring has an inverted cone structure with a gradually increasing diameter from bottom to top.

19. The pressurized water injection device according to claim 10, wherein the movable rod comprises a sucker rod joint, a connecting rod, a connecting sleeve and a plunger which are sequentially connected from top to bottom, the connecting rod is of a column structure which is vertically arranged, the sucker rod joint, the connecting sleeve and the plunger are of a column structure which is vertically arranged and is provided with two open ends, a concave part is formed at the bottom of the connecting rod, a third water delivery hole is formed on the inner wall of the concave part and is opposite to the second water delivery hole, the concave part, the inside of the connecting sleeve and the inner space of the plunger are sequentially communicated from top to bottom to form the water delivery cavity, the top of the sucker rod joint is connected to the bottom of the sucker rod, and the second one-way valve is arranged at the bottom of the plunger;

20. The pressurized-water injector according to claim 19, wherein the second check valve comprises a second valve seat, a second valve seat sleeve and a second valve ball, the second valve seat is of an annular structure, the second valve seat sleeve is of a cylindrical structure with two ends open, the top of the second valve seat sleeve is connected with the bottom of the plunger, the second valve seat is arranged in the second valve seat sleeve, a second valve plate is arranged in the second valve seat sleeve and above the second valve seat, a second accommodating cavity is formed between the second valve plate and the second valve seat, the second valve ball is movably arranged in the second accommodating cavity, the bottom outer wall of the second valve ball can be abutted against the inner side edge of the top of the second valve seat, and a plurality of second through holes for communicating the second accommodating cavity with the inside of the plunger are formed in the second valve plate.

21. The pressurized-water injector of claim 20, wherein the second check valve further comprises a pressure ring, an upper portion of the pressure ring is located inside the second valve seat sleeve, an outer wall of the upper portion of the pressure ring is connected with an inner wall of the lower portion of the second valve seat sleeve, a seventh positioning boss is disposed on the inner wall of the second valve seat sleeve above the pressure ring, and a top and a bottom of the second valve seat are respectively abutted with a bottom of the seventh positioning boss and a top of the pressure ring.

22. The pressurized water injection device of claim 1, wherein the first sealing joint is a vertically arranged cylindrical structure with two ends open, and the outer wall of the first sealing joint is tightly attached to the inner wall of the lower return joint.

23. The pressurized water injector of claim 22, wherein a plurality of fourth sealing rings are disposed between said first sealing joint and said lower return joint.